  // 1px线的制作
  .hairline-common() {
    position: absolute;
    box-sizing: border-box;
    content: ' ';
    pointer-events: none;
  }

  .hairline-bottom(@color: @border-color, @left: 0, @right: 0) {
    .hairline-common();
    right: @right;
    bottom: 0;
    left: @left;
    border-bottom: 1px solid @color;
    transform: scaleY(0.5);
  }